As some sales types will require less work than others, you may decide to vary the level of the contributions by sales type. For example, the time spent on preliminary costing, work preparation, planning, and purchasing may be less for repeat orders than for engineering orders.
To apportion indirect costs based on sales type, define contributions by sales type. This will result in different contribution sums being assigned to different sales types.
Note: First define the individual contributions in the Contributions file. Then register them as a contribution for a sales type.